Method of preparing expansion-joint composition



Aug. 7; 1928. 1,680,144

A. c. FISCHER IETHOD 0F PREPARING EXPANSION JOINT COMPOSITION Filed Hay10, 1922 INVE OR Patented Aug. 7, 1928.

UNITED STATES PATENT OFFICE.

METHOD OF PREPARING EXPANSION-JOINT COMPOSITION.

Application filed May 10,

The invention relates to improvement in expansion joints and to themethod of the construction of same, as more fully described hereinafterand particularly pointed out in the claims.

Heretofore it has been the practice in the manufacture of expansionjoints to impregnate felt strips and build them into layers or reinforceasphalt mixtures with saturated felt sides, also the prior art teachesfibrous matter mixed withtar, pitch or bituminous substances.

In all the instances known to me the fibrous matter has been impregnatedwith the water-proofing mass to an extent which defeats the purposes ofthe present invention; that is to say the mixtures have been effectedwith materials heated to such a consistency that the contents aresaturated thoroughly and the mass becomes a saturated mixture andconsequently contains few if any air cells. On the other hand therigidity of the fibre for structural purposes is destroyed, and it doesnot act as a separate structural skeleton for the surrounding mass.Consequently, in warm weather expansion joints made by the old methodbecome limp and flabby, because of their lack of structural frameworkacting independently of the surroundin mass.

By my method 0 mixing cellular granules, unsaturated fibrous matter andother like substances such as excelsior cut in small lengths, stifffibrous flax, etc. and incorporating same in the mixture while the.bituminous matrix is merely plastic as distinguished from liquid andtherefore lacking in penetration power, I am able to effect a structuralskeleton within the matrix which supports the matrix in warmertemperatures; and because of the inherent physical properties of thegranules, fibrous matter, or the like.

I am also able to eflect cells or pockets in the structure which allowfor compressibility, and because of the unsaturated materials orcellular granules the walls of the bituminous matrix which surrounds theparticles cannot adhere together upon compression and will thereforerespond to expansion upon release of the compression. Certain fi res,such as, mineral wool cause the walls of the matrix to hardenimmediately where in contact, which also make for a stronger structure,so that there is a structural strengthening both by chemical action and1922. Serial No. 559,908.

by preserved rigidit in the fibrous matter which is unsaturate I haveafforded through this method the possibility of effecting several typesof structure, namely a bituminous and fibrous mixture effecting achemical change strengthening the structure, a bituminous and fibrousmixture strengthening the structure due to unsaturated brous matter; abituminous cellular structure containing within the cells granules, suchas, cork, which in itself is cellular, screened mineral wool granules,which are also cellular, treated wool granules in a cellular state andany other like form of cellular or fibrous matted matter, such as,excelsior, digested straw, flax, etc. in an unsaturated state, or atleast not solidly saturated by penetration of the bituminous matrix.

In the drawings, Figure 1 represents an expansion joint containingbituminous material (a) and mineral wool fibre (b) the chemical actionof the fibre having strengthened the bituminous wall immediately aboutthem.

Figure 2 illustrates an expansion joint consisting of bituminousmaterial (a) having incorporated therein granules for the purpose offorming cells (a) or pockets (0) and the cells or pockets in turn filledwlth cellular matter (d unsaturated, but which may be waterproo ed witha non-sticky substance, so that the bituminous walls of the enclosingcells or pockets cannot adhere when compressed, at the same timeretarding heat penetration and thus strengthening the structure.

' Figure 3 illustrates the combination of Lbituminous material (a) andcells (0) or pockets containing granules or pellets (d) of cellularmatter, such as, screened wool pellets, waterproof cellular mineral woolgranules, cork granules and the like; also, distributed through thisstructure, unsaturated fibrous matter 12, such as, excelsior, digestedfiax, straw, dry wool, in fact any fibrous unsaturated substance whichmay impart rigidity when left unsaturated in a surrounding bituminousmass or cellular structure.

An expansion joint as outlined above will have the following properties:

It will resist heat penetration.

It will contain a skeleton structure to give it strength beforeinstallation in the crevice.

It will be subject to considerable compression and will re-expand withmuch less resistance.

It will compress without elongation.

What I claim as my invention is:

1. The method of preparing expansion joint composition, which consistsin mixing fibrous material, having inherent rigidity, with bituminousmatter while the bituminous matter is at a consistency below that atwhich it will saturate the fibrous material.

2. The method of preparing expansion joint composition, which cons stsin mixing fibrous material of cellular structure with bituminous matter,while the bituminous matter is of a consistency below that at which itwill saturate fibrous material.

3. The method of preparing an expansion joint composition, whichconsists in mixing cellular material with bituminous matter while thelatter is of a consistency below that at which it will saturate thecellular material.

4. The method of preparing an expansion joint composition. whichconsists in mixing fibrous and granules or pellets of a material havinga cellular structure, with bituminous matter, while the latter is of aconsistency below that at which it will saturate the cellular material.

Signed at Chicago, Illinois, this 29th day of April, A. D. 1922.

ALBERT C. FISCHER.

CERTIFICATE OF CORRECTION.

Patent No. 1,680. 144.

ALBERT C.

Granted August 7. 1928, to

FISCHER.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 2,line 25. claim 4, for the word "fibrous" read "fibers"; and that thesaid Letters Patent should he read with this correction therein that thesame may conform to the record of the case in the Patent Office.

Signed and sealed this 11th day of September, A. D. 1928.

(Seal) M. J. Moore,

Acting Commissioner of Patents.

sion and will re-expand with much less resistance.

It will compress without elongation.

What I claim as my invention is:

1. The method of preparing expansion joint composition, which consistsin mixing fibrous material, having inherent rigidity, with bituminousmatter while the bituminous matter is at a consistency below that atwhich it will saturate the fibrous material.

2. The method of preparing expansion joint composition, which cons stsin mixing fibrous material of cellular structure with bituminous matter,while the bituminous matter is of a consistency below that at which itwill saturate fibrous material.

3. The method of preparing an expansion joint composition, whichconsists in mixing cellular material with bituminous matter while thelatter is of a consistency below that at which it will saturate thecellular material.

4. The method of preparing an expansion joint composition. whichconsists in mixing fibrous and granules or pellets of a material havinga cellular structure, with bituminous matter, while the latter is of aconsistency below that at which it will saturate the cellular material.

Signed at Chicago, Illinois, this 29th day of April, A. D. 1922.

ALBERT C. FISCHER.

CERTIFICATE OF CORRECTION.

Patent No. 1,680. 144.

ALBERT C.

Granted August 7. 1928, to

FISCHER.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 2,line 25. claim 4, for the word "fibrous" read "fibers"; and that thesaid Letters Patent should he read with this correction therein that thesame may conform to the record of the case in the Patent Office.

Signed and sealed this 11th day of September, A. D. 1928.

(Seal) M. J. Moore,

Acting Commissioner of Patents.

